Li Si, Wade-Giles romanization Li Ssu (born 280? bce, Shangcai, Chu state [in present-day Henan province], China—died 208 bce, Xianyang, Shaanxi province) Chinese statesman who utilized the ruthless but efficient ideas of the political philosophy of Legalism to weld the warring Chinese states of his time into the first centralized Chinese empire, ruled by the Qin dynasty (221–207 bce).

In 247 bce he entered the state of Qin to begin almost 40 years of service under the ruler later known as Shihuangdi (“First Sovereign Emperor”). As minister to the emperor, Li was responsible for most of the radical political and cultural innovations made in Qin after 221 bce.

Li caused the empire to abolish the fief states and to be divided into 36 regions, each governed by a centrally appointed official. Under his guidance the emperor standardized coinage and weights and measures and began construction of the Great Wall to keep out barbarians from the north. Li Si also was influential in creating a unified writing system, which remained substantially the same until recent times. Finally, in an effort to prevent the growth of subversive thought, Li in 213 bce forbade the teaching of history and ordered the “burning of the books,” for which he earned the opprobrium of all future generations of Confucian scholars. When the emperor died in 210 bce, Li became involved in the plot of the eunuch Zhao Gao to void the proper succession. But the two conspirators quarreled, and Zhao Gao had Li executed.

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school of Chinese philosophy that attained prominence during the turbulent Warring States era (475–221 bce) and, through the influence of the philosophers Shang Yang, Li Si, and Hanfeizi, formed the ideological basis of China’s first imperial dynasty, the Qin (221–207 bce).

dynasty that established the first great Chinese empire. The Qin—which lasted only from 221 to 207 bce but from which the name China is derived—established the approximate boundaries and basic administrative system that all subsequent Chinese dynasties were to follow for the next two...

c. 259 bce Qin state, northwestern China 210 bce Hebei emperor (reigned 221–210 bce) of the Qin dynasty (221–207 bce) and creator of the first unified Chinese empire (which collapsed, however, less than four years after his death).